/**
  ******************************************************************************
  * @file    stm32f4xx_exti.c
  * @author  MCD Application Team
  * @version V1.1.0
  * @date    11-January-2013
  * @brief   This file provides firmware functions to manage the following
  *          functionalities of the EXTI peripheral:
  *           + Initialization and Configuration
  *           + Interrupts and flags management
  *
@verbatim

 ===================================================================
                       ##### EXTI features #####
 ===================================================================

 [..] External interrupt/event lines are mapped as following:
   (#) All available GPIO pins are connected to the 16 external
       interrupt/event lines from EXTI0 to EXTI15.
   (#) EXTI line 16 is connected to the PVD Output
   (#) EXTI line 17 is connected to the RTC Alarm event
   (#) EXTI line 18 is connected to the USB OTG FS Wakeup from suspend event
   (#) EXTI line 19 is connected to the Ethernet Wakeup event
   (#) EXTI line 20 is connected to the USB OTG HS (configured in FS) Wakeup event
   (#) EXTI line 21 is connected to the RTC Tamper and Time Stamp events
   (#) EXTI line 22 is connected to the RTC Wakeup event


                ##### How to use this driver #####
 ===================================================================

 [..] In order to use an I/O pin as an external interrupt source, follow steps
      below:
   (#) Configure the I/O in input mode using GPIO_Init()
   (#) Select the input source pin for the EXTI line using SYSCFG_EXTILineConfig()
   (#) Select the mode(interrupt, event) and configure the trigger
       selection (Rising, falling or both) using EXTI_Init()
   (#) Configure NVIC IRQ channel mapped to the EXTI line using NVIC_Init()

 [..]
   (@) SYSCFG APB clock must be enabled to get write access to SYSCFG_EXTICRx
       registers using RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

@endverbatim
  *
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2013 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_exti.h"

/** @addtogroup STM32F4xx_StdPeriph_Driver
  * @{
  */

/** @defgroup EXTI
  * @brief EXTI driver modules
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/

#define EXTI_LINENONE    ((uint32_t)0x00000)  /* No interrupt selected */

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/** @defgroup EXTI_Private_Functions
  * @{
  */

/** @defgroup EXTI_Group1 Initialization and Configuration functions
 *  @brief   Initialization and Configuration functions
 *
@verbatim
 ===============================================================================
             ##### Initialization and Configuration functions #####
 ===============================================================================

@endverbatim
  * @{
  */

/**
  * @brief  Deinitializes the EXTI peripheral registers to their default reset values.
  * @param  None
  * @retval None
  */
void EXTI_DeInit(void)
{
	EXTI->IMR = 0x00000000;
	EXTI->EMR = 0x00000000;
	EXTI->RTSR = 0x00000000;
	EXTI->FTSR = 0x00000000;
	EXTI->PR = 0x007FFFFF;
}

/**
  * @brief  Initializes the EXTI peripheral according to the specified
  *         parameters in the EXTI_InitStruct.
  * @param  EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure
  *         that contains the configuration information for the EXTI peripheral.
  * @retval None
  */
void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct)
{
	uint32_t tmp = 0;

	/* Check the parameters */
	assert_param(IS_EXTI_MODE(EXTI_InitStruct->EXTI_Mode));
	assert_param(IS_EXTI_TRIGGER(EXTI_InitStruct->EXTI_Trigger));
	assert_param(IS_EXTI_LINE(EXTI_InitStruct->EXTI_Line));
	assert_param(IS_FUNCTIONAL_STATE(EXTI_InitStruct->EXTI_LineCmd));

	tmp = (uint32_t)EXTI_BASE;

	if(EXTI_InitStruct->EXTI_LineCmd != DISABLE) {
		/* Clear EXTI line configuration */
		EXTI->IMR &= ~EXTI_InitStruct->EXTI_Line;
		EXTI->EMR &= ~EXTI_InitStruct->EXTI_Line;

		tmp += EXTI_InitStruct->EXTI_Mode;

		*(__IO uint32_t*) tmp |= EXTI_InitStruct->EXTI_Line;

		/* Clear Rising Falling edge configuration */
		EXTI->RTSR &= ~EXTI_InitStruct->EXTI_Line;
		EXTI->FTSR &= ~EXTI_InitStruct->EXTI_Line;

		/* Select the trigger for the selected external interrupts */
		if(EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling) {
			/* Rising Falling edge */
			EXTI->RTSR |= EXTI_InitStruct->EXTI_Line;
			EXTI->FTSR |= EXTI_InitStruct->EXTI_Line;
		} else {
			tmp = (uint32_t)EXTI_BASE;
			tmp += EXTI_InitStruct->EXTI_Trigger;

			*(__IO uint32_t*) tmp |= EXTI_InitStruct->EXTI_Line;
		}
	} else {
		tmp += EXTI_InitStruct->EXTI_Mode;

		/* Disable the selected external lines */
		*(__IO uint32_t*) tmp &= ~EXTI_InitStruct->EXTI_Line;
	}
}

/**
  * @brief  Fills each EXTI_InitStruct member with its reset value.
  * @param  EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure which will
  *         be initialized.
  * @retval None
  */
void EXTI_StructInit(EXTI_InitTypeDef* EXTI_InitStruct)
{
	EXTI_InitStruct->EXTI_Line = EXTI_LINENONE;
	EXTI_InitStruct->EXTI_Mode = EXTI_Mode_Interrupt;
	EXTI_InitStruct->EXTI_Trigger = EXTI_Trigger_Falling;
	EXTI_InitStruct->EXTI_LineCmd = DISABLE;
}

/**
  * @brief  Generates a Software interrupt on selected EXTI line.
  * @param  EXTI_Line: specifies the EXTI line on which the software interrupt
  *         will be generated.
  *         This parameter can be any combination of EXTI_Linex where x can be (0..22)
  * @retval None
  */
void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line)
{
	/* Check the parameters */
	assert_param(IS_EXTI_LINE(EXTI_Line));

	EXTI->SWIER |= EXTI_Line;
}

/**
  * @}
  */

/** @defgroup EXTI_Group2 Interrupts and flags management functions
 *  @brief   Interrupts and flags management functions
 *
@verbatim
 ===============================================================================
             ##### Interrupts and flags management functions #####
 ===============================================================================

@endverbatim
  * @{
  */

/**
  * @brief  Checks whether the specified EXTI line flag is set or not.
  * @param  EXTI_Line: specifies the EXTI line flag to check.
  *          This parameter can be EXTI_Linex where x can be(0..22)
  * @retval The new state of EXTI_Line (SET or RESET).
  */
FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line)
{
	FlagStatus bitstatus = RESET;
	/* Check the parameters */
	assert_param(IS_GET_EXTI_LINE(EXTI_Line));

	if((EXTI->PR & EXTI_Line) != (uint32_t)RESET) {
		bitstatus = SET;
	} else {
		bitstatus = RESET;
	}

	return bitstatus;
}

/**
  * @brief  Clears the EXTI's line pending flags.
  * @param  EXTI_Line: specifies the EXTI lines flags to clear.
  *          This parameter can be any combination of EXTI_Linex where x can be (0..22)
  * @retval None
  */
void EXTI_ClearFlag(uint32_t EXTI_Line)
{
	/* Check the parameters */
	assert_param(IS_EXTI_LINE(EXTI_Line));

	EXTI->PR = EXTI_Line;
}

/**
  * @brief  Checks whether the specified EXTI line is asserted or not.
  * @param  EXTI_Line: specifies the EXTI line to check.
  *          This parameter can be EXTI_Linex where x can be(0..22)
  * @retval The new state of EXTI_Line (SET or RESET).
  */
ITStatus EXTI_GetITStatus(uint32_t EXTI_Line)
{
	ITStatus bitstatus = RESET;
	uint32_t enablestatus = 0;
	/* Check the parameters */
	assert_param(IS_GET_EXTI_LINE(EXTI_Line));

	enablestatus =  EXTI->IMR & EXTI_Line;

	if(((EXTI->PR & EXTI_Line) != (uint32_t)RESET) && (enablestatus != (uint32_t)RESET)) {
		bitstatus = SET;
	} else {
		bitstatus = RESET;
	}

	return bitstatus;
}

/**
  * @brief  Clears the EXTI's line pending bits.
  * @param  EXTI_Line: specifies the EXTI lines to clear.
  *          This parameter can be any combination of EXTI_Linex where x can be (0..22)
  * @retval None
  */
void EXTI_ClearITPendingBit(uint32_t EXTI_Line)
{
	/* Check the parameters */
	assert_param(IS_EXTI_LINE(EXTI_Line));

	EXTI->PR = EXTI_Line;
}

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
